The couple dated for two years before announcing their engagement in April 2023 after Hugh popped the question at his family home, Eaton Hall, located four miles from the cathedral and where the wedding reception will take place later this afternoon.
Westminster Wedding
Take a look at the best photos from the wedding day so far...
On the morning of the wedding, the Grade I-listed cathedral looked absolutely spectacular, with the main doors adorned with a floral arch. The flowers on display inside the cathedral included rambling roses, philadelphus, campanula, and orlaya grandiflora, as well as birch trees.
Following the wedding, the trees will be replanted at Hugh's family home, Eaton Hall, while the flowers will be repurposed and distributed to local organisations.
The bride and groom chose flowers from local growers through the 'Flowers from the Farm' network, which champions artisan growers. Many of the flowers seen also came from the Grosvenor's Eaton Estate.
Crowds started to form early on Friday morning, with well-wishers hoping to catch a glimpse of the well-heeled guests, the bride and groom, and Prince William.
Ahead of the wedding, Hugh, 33, acknowledged the interest in his big day, telling Town & Country: "I also just wanted to make it very clear how unbelievably helpful people have been, how supportive they've been so far which I'm unbelievably grateful for.
"Because I do realise that it's going to be a big thing for the city. It's going to be certainly a huge thing for us, so we're just really grateful for all the help."
Looking smart in a morning suit, William was spotted arriving at Chester Cathedral with the rest of the ushers in a Mercedes van. They were dropped off at a side entrance.
William's cousin Princess Eugenie was previously not reported to be attending the wedding, although she had been spotted in Chester enjoying pre-wedding drinks with other guests on Thursday night.
Making an appearance at around 11am with her friend and former Vogue editor Violet Henderson-Vestey, the mother-of-two looked delightful in an olive green number by Joseph and a cream fascinator by Emily London Millinery.
She accessorized with an Anya Hindmarch clutch and wore nude suede pumps by Aquazzura.
WESTMINSTER WEDDING: AT A GLANCE
The Duke of Westminster and his bride-to-be, Miss Olivia Henson
Meet the bride
Miss Olivia Henson, 31, was educated at Marlborough College, whose alumni include Kate and Pippa Middleton.
She gained a a degree from Trinity in Ireland.
Olivia is now Senior Account Manager at Belazu, a B-corp ingredient company.
The wedding venue
The Duke and future Duchess of Westminster will tie the knot at the breathtaking Chester Cathedral
The space is where his late father's memorial was held, and is set in the city where he grew up.
Olivia revealed to Town & Country that Chester is "the place where we will live, where we will be building our lives together."
The wedding guests
The Grosvenors are a family with a long-standing connection to the royal family; Hugh is a lifelong friend of Princes William and Harry.
The Prince of Wales has been confirmed to be one of the Duke's ushers.
Looking just a little nervous, Hugh was met with cheers and applause as he arrived at Chester Cathedral at around 11:15am. He smiled and waved to the crowds of well-wishers.
The groom was welcomed by The Very Revd Dr Tim Stratford, the Dean of Chester, who conducted the ceremony.
The Right Revd Mark Tanner preached, while Revd Canon Rosie Woodall led the prayers.
Speaking exclusively to HELLO! on the eve of the wedding, the Dean shared the significance of holding the wedding at the Duke's family church, highlighting Chester as a place the bride Olivia "has fallen in love with". He also expressed his pride in the couple for choosing this special venue for their wedding.
Members of the Grosvenor family who were spotted filing into the cathedral included the groom's mother, Natalia, Duchess of Westminster, who was widowed in 2016 when her husband Gerald Grosvenor, 6th Duke of Westminster, died unexpectedly of a heart attack.
Natalia looked pretty in pink, matching her daughter Lady Edwina.
Natalia was flanked by her three daughters and Hugh's sisters, Lady Tamara, Lady Edwina, and Lady Viola, who all waved to the crowds before heading in for the ceremony.
Hugh van Cutsem, a friend of the royals, was on hand to greet the groom's family as they arrived.
Hugh's daughter Grace famously acted as a bridesmaid at William and Kate's royal wedding in 2011, while his late father, Hugh van Cutsem Sr., was King Charles' best friend from Cambridge.
Shortly before noon, blushing bride Olivia arrived at the cathedral with her father Rupert Henson.
They were chauffeured in a vintage Bentley, provided by the Heritage Collection of Bentley Motors in Crewe. The car was originally made for W.O. Bentley, the founder of Bentley Motors, in 1930.
WATCH: Olivia Henson fights off the wind as she shows off stunning wedding dress
The bespoke embroidery design on her gown and veil was hand drawn and reimagined by the designer, incorporating floral motifs and edgings from Olivia's great-great-grandmother's veil from around 1880.
Much had been said about which tiara Olivia would wear on her wedding day.
She accessorized with the Faberge Myrtle Leaf Tiara made specifically for Grosvenor brides to wear at their nuptials. The tiara has been in the Grosvenor family since its creation in 1906.
She carried a bouquet of flowers, picked from the Eaton Hall gardens, comprising Meadow grass, Ox eye daisies, Iris, Rose, Clematis, Mock orange, Scabious, Sweet pea, Astrantia, Martagon lily and Love in a mist.
Hugh's sisters Lady Edwina (in pink) and Lady Viola (in red), as well as Edwina's presenter and historian husband Dan Snow, mingled outside the cathedral.
Hugh's sister Lady Viola, wearing a Selected Femme off-the-shoulder maxi dress and Aquazurra pumps and carrying a Fendi bag, was pictured with her husband Angus Roberts.
The wedding reception is taking place at Eaton Hall, the Grosvenor family's ancestral seat, which Hugh inherited when his father Gerald passed away eight years ago.
Hugh is the richest man in the UK under the age of 40, boasting a fortune of £10.1 billion, making him far wealthier than his friend William and his godfather King Charles.
He amassed his wealth – his title, the family home Eaton Hall, and control of the historic Grosvenor Estate – aged 25. His property company, Grosvenor Group, of which he is Chair, owns about 300 acres of land in London's most affluent areas, Mayfair and Belgravia, as well as major city centre developments such as Liverpool's ONE shopping centre.
The Duke is also Chair of the Westminster Foundation, a charitable organisation that focuses on helping vulnerable youth and their families.
The roughly 400 guests in attendance were whisked off in minibuses for the reception at Eaton Hall.
Sign up to HELLO! Daily for all the latest and best royal coverage
By entering your details, you are agreeing to HELLO! Magazine User Data Protection Policy. You can unsubscribe at any time. For more information, please click here.
